Deadly Moscow Subway Crash Kills at Least 20

Rescue teams work inside the tunnel where a rush-hour subway train derailed killing at least 20 people and sending 150 others to the hospital, Moscow, July 15, 2014.

Rescue teams work inside the tunnel where a rush-hour subway train derailed, Moscow, July 15, 2014.

An emergency services helicopter approaches the metro station entrance following an accident on the subway, in Moscow, July 15, 2014.

Members of emergency services wait outside a metro station following an accident on the subway in Moscow, July 15, 2014.

Paramedics carry an injured woman to a medical helicopter in Moscow, July 15, 2014.

Paramedics carry an injured woman to a medical helicopter from a subway station after a rush-hour subway train derailment, in Moscow, July 15, 2014.

Members of emergency services stand near a map of metro train lines outside the station following an accident on the subway, in Moscow, July 15, 2014.

Members of emergency services carry an injured passenger outside a metro station following an accident on the subway, in Moscow, July 15, 2014.

An emergency service helicopter lands outside a metro station following an accident on the subway in Moscow, July 15, 2014.